CN106153300A - A kind of rigid endoscope light efficiency uniformity detecting method - Google Patents
A kind of rigid endoscope light efficiency uniformity detecting method Download PDFInfo
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- CN106153300A CN106153300A CN201510130026.2A CN201510130026A CN106153300A CN 106153300 A CN106153300 A CN 106153300A CN 201510130026 A CN201510130026 A CN 201510130026A CN 106153300 A CN106153300 A CN 106153300A
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Abstract
The invention discloses a kind of rigid endoscope light efficiency uniformity detecting method, the method realizes the detection of rigid endoscope imaging lens body light efficiency uniformity and the detection to imaging lens body in rigid endoscope Yu illuminating mirror body comprehensive light efficiency uniformity based on detecting system；Detection device therein is electric control gear, decreases artificial intervention, improves certainty of measurement, and automaticity is high；Use CCD imaging Computer display, replace human eye directly directly to be observed by endoscope, it is to avoid observe fatigue, easy to operate；The testing result quantity of information of the present invention is more, is no longer to reflect the light efficiency on the band of a certain specific visual field, and it can reflect the light efficiency uniformity on whole rigid endoscope visual field；Can preferably reflect the optical property of rigid endoscope；The present invention by carrying out the impact testing or using light barrier to eliminate veiling glare in darkroom so that testing result is more accurate.
Description
Technical field
The present invention relates to rigid endoscope detection technique field, particularly relate to a kind of for rigid endoscope light efficiency
The method of uniformity detection, it is adaptable to variety classes, different length, the rigid endoscope of different viewing directional angle
The detection of optical property light efficiency uniformity.
Background technology
Along with becoming increasingly popular of Minimal Invasive Endoscopic operation, people's safety to endoscope product clinical practice
The most progressively develop with effectiveness understanding and deepen, rigid endoscope performance indications especially optical property direct or
Indirectly relate to the safety of patient.
Light efficiency uniformity is a critically important parameter of rigid endoscope.At present, the most all of rigid
Endoscope's existence inhomogeneities the most more or less, the phenomenon bright in the middle of appearance in visual field, edge is dark.For
Clinical medicine staff, yes is the bigger the better for visual field range of observation, in order to see marginal position clearly, inevitable
Incident intensity to be increased, increases incident intensity and can cause again the increase of central light strength, and due to human body 70% all
Being moisture, the reflectance of liquid surface is the highest, and this makes again can be the most dazzling in the middle of visual field, impact perform the operation into
OK；The most just lose the meaning that big visual field is observed.
For the detection of rigid endoscope light efficiency uniformity, the most unified examination criteria.
At present, domestic existing light efficiency uniformity examination criteria is: at operating distance, measured by illumination
Measure the illumination of certain visual field band (at maximum field of view 90%) upper 4 orthogonal orientation, then asked by calculating
Obtain edge uniformity and light efficiency.During measurement, mainly by manual detection, complex operation, measure the cycle
Long, accuracy is the highest, poor repeatability, and quantity of information is few, the light efficiency of only one of which visual field band.
Summary of the invention
In view of this, the invention provides a kind of method for the detection of rigid endoscope light efficiency uniformity, can
Realize variety classes, different length, the optical property light efficiency uniformity of rigid endoscope of different viewing directional angle
Detection.
A kind of rigid endoscope light efficiency uniformity detecting method, the method realizes rigid interior based on detecting system
Sight glass imaging lens body light efficiency uniformity detects and to imaging lens body in rigid endoscope and the comprehensive light efficiency of illuminating mirror body
The detection of uniformity；Wherein, described detecting system includes: the first line slideway, the second line slideway, CCD
Video camera, rotatable platform, support, uniform blank and liquid crystal display screen；Described ccd video camera is pacified by support
Being contained on the first line slideway, the camera lens of ccd video camera is fixed on the emergent pupil end of rigid endoscope；Described turn
Moving platform is arranged on the first line slideway, and the second line slideway is fixed on rotatable platform, uniform blank and
Liquid crystal display screen is arranged on the second line slideway, and the entrance pupil end of rigid endoscope is towards uniform blank；
Described rigid endoscope imaging lens body light efficiency uniformity detecting method includes:
S01, remove described uniform blank, adjust the second line slideway and rotatable platform, make liquid crystal display screen, rigid
Endoscope and ccd video camera are coaxial, meanwhile, make rigid endoscope entrance pupil end vertical with liquid crystal display screen；
S02, mobile second line slideway, make liquid crystal display screen be positioned at the operating distance of rigid endoscope, light liquid
Brilliant screen so that it is as uniform source of light；
S03, the front lens group of regulation ccd video camera so that it is can blur-free imaging；Adjustable liquid crystal display screen brightness,
Ensure enough brightness, and do not make ccd video camera saturated；
S04, control ccd video camera gather the image of rigid endoscope emergent pupil end, then perform S05 to S09；
S05, image is carried out pretreatment, particularly as follows: the image that previous step obtains is converted into gray level image；
Then draw the rectangular histogram of this gray level image, find histogrammic peak value, record the gray value that this peak value is corresponding,
As background noise it is worth；The background noise of described gray level image is removed according to the noise floor value obtained；Then
Described gray level image is carried out Wiener filtering, carries out denoising；
S06, according to pretreated gray level image, find the central coordinate of circle of rigid endoscope visual field；
S07, central coordinate of circle according to described rigid endoscope visual field, calculate the radius of rigid endoscope visual field；
S08, in described S05 after denoising in gray level image find gray scale maximum, peep in rigid
Gray value at the home position of mirror visual field；
S09, in rigid endoscope field range, by the ash of each pixel that the distance to the described center of circle is x
Angle value is averaged, and as gray average corresponding at this distance x, by that analogy, obtains distance x 0 to half
The gray value that in the range of electrical path length, each distance is corresponding；With distance x as abscissa, with the gray scale that distance x is corresponding
Average is vertical coordinate, draws curve chart；
S10, then by the abscissa of this curve chart divided by rigid endoscope visual field radius value, by vertical coordinate divided by
Circle centre position gray value, obtains characterizing the light efficiency uniformity profile figure of the imaging lens body of rigid endoscope；
The process bag of the detection of imaging lens body and illuminating mirror body comprehensive light efficiency uniformity in described rigid endoscope
Include:
S11, close liquid crystal display screen, adjust the second line slideway and rotatable platform so that uniformly blank, rigid in
Sight glass and ccd video camera are coaxial, make rigid endoscope entrance pupil end vertical with uniform blank simultaneously；
S12, mobile second line slideway, make uniform blank be positioned at the operating distance of rigid endoscope, connect
The light source that the light cone mouth of rigid pipe endoscope accesses；
S13, the front lens group of regulation ccd video camera so that it is can blur-free imaging；Regulate described light source bright
Degree, it is ensured that enough brightness, and do not make ccd video camera saturated；
S14, control ccd video camera gather the image of rigid endoscope emergent pupil end, perform step S05 to step
S09, it is thus achieved that perform S15 after curve chart；
S15, the abscissa of curve chart step S14 obtained are indulged divided by rigid endoscope visual field radius value, general
Coordinate, divided by circle centre position gray value, obtains characterizing imaging lens body and the comprehensive light efficiency of illuminating mirror body of rigid endoscope
Uniformity profile figure.
It is also preferred that the left the method finding the central coordinate of circle of rigid endoscope visual field in described S06 is: first with limit
Edge detection algorithm obtains the threshold value of binaryzation, described gray level image carries out binary conversion treatment, then asks for two
The geometry barycenter of value image, the coordinate of this geometry barycenter is the central coordinate of circle of rigid endoscope visual field.
It is also preferred that the left in described step S09, take any two in circular rigid endoscope visual field mutually perpendicular directly
The gray value of each measured point that distance is x in the center of circle, as measured point, is averaged, as this by the point on footpath
Gray average corresponding at distance x, thus obtains described curve chart.
It is also preferred that the left described, the detection of rigid endoscope imaging lens body light efficiency uniformity is become with in rigid endoscope
As the detection of mirror body light efficiency comprehensive with illuminating mirror body uniformity is carried out in darkroom.
It is also preferred that the left described uniform blank or the both sides of liquid crystal display screen and above place light tight baffle plate, reduce
The impact of the transmission light outside rigid endoscope visual field.
There is advantages that
(1) the detection device used in the detection method of the present invention is electric control gear, decreases artificial intervention,
Improve certainty of measurement, automaticity is high；Use CCD imaging Computer display, replace human eye direct
Directly observed by endoscope, it is to avoid observe fatigue, easy to operate；The testing result quantity of information of the present invention is more
Many, it is no longer to reflect the light efficiency on the band of a certain specific visual field, it can reflect that whole rigid endoscope regards
Light efficiency uniformity on field；Can preferably reflect the optical property of rigid endoscope.
(2) present invention by carrying out the impact testing or using light barrier to eliminate veiling glare in darkroom so that
Testing result is more accurate.
Accompanying drawing explanation
Fig. 1 is the structural representation of rigid endoscope light efficiency uniformity detection of the present invention；
Fig. 2 is the workflow diagram of rigid endoscope imaging lens body light efficiency uniformity detection of the present invention；
Fig. 3 is the workflow diagram of rigid endoscope of the present invention comprehensive mirror body light efficiency uniformity detection.
Wherein, 1-the first line slideway；2-CCD video camera；3-rigid endoscope；4-rotatable platform；5-
Two line slideways；The uniform blank of 6-；7-liquid crystal display screen；8-support.
Detailed description of the invention
Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.
The rigid endoscope light efficiency uniformity detecting method of the present invention, initially sets up detecting system, such as Fig. 1 institute
Showing, this system includes: two line slideways, ccd video camera 2, rigid endoscope 3, rotatable platform 4,
Uniformly blank 6, liquid crystal display screen 7, support 8 and image processing module.Ccd video camera 2 is pacified by support 8
Being contained on the first line slideway 1, the camera lens of ccd video camera 2 is fixed on the emergent pupil end of rigid endoscope 3；
Rotatable platform 4 is also mounted on the first line slideway 1, and the second line slideway 5 is fixed on rotatable platform 4,
Uniformly blank 6 and liquid crystal display screen 7 are arranged on the second line slideway 5, and the entrance pupil end of rigid endoscope 3 is towards all
Even blank 6.Image processing module is connected on the data output end of ccd video camera 2.
The rigid endoscope light efficiency uniformity detecting method of the present invention includes rigid endoscope imaging lens body light efficiency
Uniformity detection and the detection to imaging lens body in rigid endoscope Yu illuminating mirror body comprehensive light efficiency uniformity, its
In, when the former is detected, perform step 1 to step 9；When the latter is detected, perform step
Rapid 11 to step 19.
As in figure 2 it is shown, as follows to the method for rigid endoscope imaging lens body light efficiency uniformity detection:
1, remove uniform blank 6, adjust the second line slideway 5, rotatable platform 4, liquid crystal display screen 7, rigid in
Sight glass 3 and the position of ccd video camera 2, make three ensure coaxial as far as possible, makes rigid endoscope 3 enter simultaneously
Pupil end is vertical with liquid crystal display screen 7；
2, move the second line slideway 5, make liquid crystal display screen 7 be positioned at the operating distance of rigid endoscope 3, point
Bright liquid crystal display screen 7 so that it is as uniform source of light；
3, regulate the front lens group of ccd video camera 2, make ccd video camera 2 energy blur-free imaging；Regulation
Liquid crystal display screen 7 brightness, it is ensured that enough brightness, and do not make ccd video camera 2 saturated；
4, control ccd video camera 2 and gather the image of rigid endoscope 3 emergent pupil end, by image procossing mould
Block preserves and processes, and then carries out the calculating of light efficiency uniformity, obtains rigid endoscope imaging lens body
Light efficiency uniformity profile figure；Wherein, to the method such as step 5 of the calculating of light efficiency uniformity to step 9；
5, image is carried out pretreatment, particularly as follows: choose a width image quality relatively in the multiple image obtained
Alright, then convert the image to gray level image, and the rectangular histogram of drawing image, find the peak value of image,
Record the gray value that this peak value is corresponding, be as background noise worth；ROI area-of-interest (Region Of is set
Interest), reducing need to image range to be processed；The background removing image according to the noise floor value obtained is made an uproar
Sound；Then image is carried out Wiener filtering, carry out strict denoising；
6, according to pretreated image, finding the central coordinate of circle of rigid endoscope visual field, method is: first
Edge detection algorithm (such as sobel algorithm, canny algorithm etc.) is utilized to obtain the threshold value of binaryzation, to image
Carrying out binary conversion treatment, then ask for the geometry barycenter of image, the coordinate of this barycenter is rigid endoscope and regards
The central coordinate of circle of field；
7, according to the central coordinate of circle of described rigid endoscope visual field, the half of rigid endoscope circle visual field is calculated
Footpath (because visual field is circular, the equivalence half that EquivDiameter function can will be used to calculate sight glass circle visual field
Footpath)；
8, in the gray level image that step 5 obtains, gray scale maximum is found, as the circle of rigid endoscope visual field
The gray value of heart position；
9, with the center of circle of rigid endoscope visual field as initial point, calculate the light efficiency uniformity along radial direction, draw
Characterize the curve chart of the light efficiency uniformity of rigid endoscope, particularly as follows: in rigid endoscope field range,
Being averaged by the gray value of each pixel that the distance to the center of circle is x, the gray scale corresponding as this distance is equal
Value, by that analogy, obtains the x gray value that each distance is corresponding in the range of 0 to radius length；With to circle
Heart distance x is abscissa, with gray average corresponding for x as vertical coordinate, draws curve chart；Then to abscissa
It is normalized with vertical coordinate, it may be assumed that by the abscissa of this curve chart divided by rigid endoscope visual field radius
Value, by vertical coordinate divided by circle centre position gray value, obtain curve chart abscissa be the measured point distance far from the center of circle with
The ratio of radius, vertical coordinate is that measured point is uniform with the light efficiency of the rigid endoscope of the ratio of circle centre position gray value
Linearity curve figure.
For realizing quickly calculating, can choose in circular rigid endoscope visual field mutually perpendicular two diametrically
Point, as measured point, obtains the light efficiency uniformity profile figure of rigid endoscope according to this step said method.
As it is shown on figure 3, imaging lens body in rigid endoscope is combined by the detection method of the present invention with illuminating mirror body
The process of the detection closing light efficiency uniformity includes:
11, close liquid crystal display screen 7, adjust the second line slideway 5 and rotatable platform 4 and uniform blank 6, hard
Property endoscope 3 and the position of ccd video camera 2, make three ensure coaxial as far as possible, make rigid endoscope simultaneously
3 entrance pupil ends are vertical with uniform blank；
12, move the second line slideway 1, make uniform blank 6 be positioned at rigid endoscope 3 operating distance, connect
The light source (this light source is that rigid pipe endoscope carries accessory) that the light cone mouth of logical rigid pipe endoscope 3 accesses；
13, regulate the front lens group of ccd video camera 2, make ccd video camera 2 energy blur-free imaging；Adjust
Joint endoscope illuminator brightness, it is ensured that enough brightness, and do not make ccd video camera 2 saturated；
14, control ccd video camera 2 and gather the image of rigid endoscope 3 emergent pupil end, by image procossing mould
Block preserves and processes, and then carries out the calculating of light efficiency uniformity, obtain rigid endoscope imaging lens body with
The comprehensive light efficiency uniformity profile figure of illuminating mirror body；Wherein, the method such as step to the calculating of light efficiency uniformity
15 to step 19；
15, image is carried out pretreatment, particularly as follows: the image of acquisition is converted into gray level image, and draw
The rectangular histogram of image, finds the peak value of image, records the gray value that this peak value is corresponding, is as background noise worth；
ROI area-of-interest (Region Of Interest) is set, reduces and need image range to be processed；According to step 5
The noise floor value obtained removes the background noise of image；Then image is carried out Wiener filtering, and carries out tight
The denoising of lattice；
16, according to pretreated image, finding the central coordinate of circle of rigid endoscope visual field, method is: first
The threshold value of binaryzation is obtained, to figure first with edge detection algorithm (such as sobel algorithm, canny algorithm etc.)
As carrying out binary conversion treatment, then asking for the geometry barycenter of image, the coordinate of this barycenter is rigid endoscope
The central coordinate of circle of visual field；
17, according to the central coordinate of circle of described rigid endoscope visual field, rigid endoscope circle visual field is calculated
Radius (because visual field is circular, the equivalence that EquivDiameter function can will be used to calculate sight glass circle visual field
Radius)；
18, gray level image strong lime angle value in step 15 is found, as the home position of rigid endoscope visual field
The gray value at place；
19, with the center of circle of rigid endoscope visual field as initial point, calculate the light efficiency uniformity along radial direction, paint
The curve chart of the light efficiency uniformity of rigid endoscope is levied in tabulation, particularly as follows: in rigid endoscope field range,
Being averaged by the gray value of each pixel that the distance to the center of circle is x, the gray scale corresponding as this distance is equal
Value, by that analogy, obtains the x gray value that each distance is corresponding in the range of 0 to radius length；With to circle
Heart distance x is abscissa, with gray average corresponding for x as vertical coordinate, draws curve chart；Then to abscissa
It is normalized with vertical coordinate, it may be assumed that by the abscissa of this curve chart divided by rigid endoscope visual field radius
Value, by vertical coordinate divided by circle centre position gray value, obtain curve chart abscissa be the measured point distance far from the center of circle with
The ratio of radius, vertical coordinate is that measured point is uniform with the light efficiency of the rigid endoscope of the ratio of circle centre position gray value
Linearity curve figure.
For realizing quickly calculating, can choose in circular rigid endoscope visual field mutually perpendicular two diametrically
Point, as measured point, obtains the light efficiency uniformity profile figure of rigid endoscope according to this step said method.
Test process should be noted that item:
In order to eliminate the impact of veiling glare, whole test process is carried out in darkroom as far as possible.Alternatively, it is also possible to
The light tight baffle plate using a Ge Xian endoscope visual field size is placed on object (liquid crystal display screen 7 or uniformly blank 6)
On, reduce the impact on test of the transmission light outside rigid endoscope 3 visual field.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit the guarantor of the present invention
Protect scope.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made,
Should be included within the scope of the present invention.
Claims (5)
1. a rigid endoscope light efficiency uniformity detecting method, it is characterised in that the method is based on detection system
System realizes to the detection of rigid endoscope imaging lens body light efficiency uniformity with to imaging lens body and photograph in rigid endoscope
The detection of bright mirror body comprehensive light efficiency uniformity；Wherein, described detecting system includes: the first line slideway (1),
Second line slideway (5), ccd video camera (2), rotatable platform (4), support (8), uniform blank (6)
And liquid crystal display screen (7)；Described ccd video camera (2) is arranged on the first line slideway (1) by support (8)
On, the camera lens of ccd video camera (2) is fixed on the emergent pupil end of rigid endoscope (3)；Described rotatable platform
(4) being arranged on the first line slideway (1), the second line slideway (5) is fixed on rotatable platform (4),
Uniformly blank (6) and liquid crystal display screen (7) are arranged on the second line slideway (5), rigid endoscope (3)
Entrance pupil end is towards uniform blank (6)；
Described rigid endoscope imaging lens body light efficiency uniformity detecting method includes:
S01, remove described uniform blank (6), adjust the second line slideway (5) and rotatable platform (4), make
Liquid crystal display screen (7), rigid endoscope (3) and ccd video camera (2) its axle, meanwhile, make rigid endoscope
(3) entrance pupil end is vertical with liquid crystal display screen (7)；
S02, mobile second line slideway (5), make liquid crystal display screen (7) be positioned at the work of rigid endoscope (3)
Distance, lights liquid crystal display screen (7) so that it is as uniform source of light；
S03, the front lens group of regulation ccd video camera (2) so that it is can blur-free imaging；Adjustable liquid crystal display screen
(7) brightness, it is ensured that enough brightness, and do not make ccd video camera (2) saturated；
S04, the image of control ccd video camera (2) collection rigid endoscope (3) emergent pupil end, then perform
S05 to S09；
S05, image is carried out pretreatment, particularly as follows: the image that previous step obtains is converted into gray level image；
Then draw the rectangular histogram of this gray level image, find histogrammic peak value, record the gray value that this peak value is corresponding,
As background noise it is worth；The background noise of described gray level image is removed according to the noise floor value obtained；Then
Described gray level image is carried out Wiener filtering, carries out denoising；
S06, according to pretreated gray level image, find the central coordinate of circle of rigid endoscope visual field；
S07, central coordinate of circle according to described rigid endoscope visual field, calculate the radius of rigid endoscope visual field；
S08, in described S05 after denoising in gray level image find gray scale maximum, peep in rigid
Gray value at the home position of mirror visual field；
S09, in rigid endoscope field range, by the ash of each pixel that the distance to the described center of circle is x
Angle value is averaged, and as gray average corresponding at this distance x, by that analogy, obtains distance x 0 to half
The gray value that in the range of electrical path length, each distance is corresponding；With distance x as abscissa, with the gray scale that distance x is corresponding
Average is vertical coordinate, draws curve chart；
S10, then by the abscissa of this curve chart divided by rigid endoscope visual field radius value, by vertical coordinate divided by
Circle centre position gray value, obtains characterizing the light efficiency uniformity profile figure of the imaging lens body of rigid endoscope (3)；
The process bag of the detection of imaging lens body and illuminating mirror body comprehensive light efficiency uniformity in described rigid endoscope
Include:
S11, closedown liquid crystal display screen (7), adjust the second line slideway (5) and rotatable platform (4) so that uniformly
Blank (6), rigid endoscope (3) and ccd video camera (2) are coaxial, make rigid endoscope (3) simultaneously
Entrance pupil end is vertical with uniform blank (6)；
S12, mobile second line slideway (5), make uniform blank (6) be positioned at the work of rigid endoscope (3)
Make distance, connect the light source that the light cone mouth of rigid pipe endoscope (3) accesses；
S13, the front lens group of regulation ccd video camera (2) so that it is can blur-free imaging；Regulate described light
Source brightness, it is ensured that enough brightness, and do not make ccd video camera (2) saturated；
S14, the image of control ccd video camera (2) collection rigid endoscope (3) emergent pupil end, perform step
S05 is to step S09, it is thus achieved that perform S15 after curve chart；
S15, the abscissa of curve chart step S14 obtained are indulged divided by rigid endoscope visual field radius value, general
Coordinate, divided by circle centre position gray value, obtains characterizing the imaging lens body of rigid endoscope (3) and illuminating mirror body is comprehensive
Light efficiency uniformity profile figure.
2. a kind of rigid endoscope light efficiency uniformity detecting method as claimed in claim 1, it is characterised in that
The method of the central coordinate of circle finding rigid endoscope visual field in described S06 is: obtain first with edge detection algorithm
Take the threshold value of binaryzation, described gray level image is carried out binary conversion treatment, then asks for the several of binary image
What barycenter, the coordinate of this geometry barycenter is the central coordinate of circle of rigid endoscope visual field.
3. a kind of rigid endoscope light efficiency uniformity detecting method as claimed in claim 1, it is characterised in that
In described step S09, take the mutually perpendicular some conduct diametrically of any two in circular rigid endoscope visual field
Measured point, is averaged the gray value of each measured point that distance is x in the center of circle, as correspondence at this distance x
Gray average, thus obtains described curve chart.
4. a kind of rigid endoscope light efficiency uniformity detecting method as claimed in claim 1, it is characterised in that
Described to the detection of rigid endoscope imaging lens body light efficiency uniformity with to imaging lens body and illumination in rigid endoscope
The detection of mirror body comprehensive light efficiency uniformity is carried out in darkroom.
5. a kind of rigid endoscope light efficiency uniformity detecting method as claimed in claim 1, it is characterised in that
Place light tight baffle plate in described uniform blank (6) or the both sides of liquid crystal display screen (7) and top, reduce hard
The impact of the transmission light outside property endoscope visual field.
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| CN109506898A (en) * | 2018-10-09 | 2019-03-22 | 苏州中科先进技术研究院有限公司 | A kind of Medical endoscope cold light source illumination uniformity detection device |
| CN113724256A (en) * | 2021-11-01 | 2021-11-30 | 极限人工智能有限公司 | Lighting mirror body light efficiency test system of endoscope |
| CN113724256B (en) * | 2021-11-01 | 2022-01-18 | 极限人工智能有限公司 | Lighting mirror body light efficiency test system of endoscope |
| CN114216652A (en) * | 2022-02-23 | 2022-03-22 | 南京市计量监督检测院 | Portable medical endoscope testing system and testing method |
| CN114216652B (en) * | 2022-02-23 | 2022-05-17 | 南京市计量监督检测院 | Portable medical endoscope testing system and testing method |
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| CN106153300B (en) | 2018-07-06 |
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Denomination of invention: A method for measuring the uniformity of light efficiency of rigid endoscope Effective date of registration: 20200923 Granted publication date: 20180706 Pledgee: Liu Liang Pledgor: WTI (Beijing) Asia-Pacific Photoelectric Instrument Co.,Ltd. Registration number: Y2020990001157 |